serotinous
adjective
se·rot·i·nous sə-ˈrät-nəs 
-ˈrä-tə-;
ˌser-ə-ˈtī-nəs
: remaining closed on the tree with seed dissemination delayed or occurring gradually
serotinous cones
serotiny
sə-ˈrät-nē
noun -ˈrä-tə-
Example Sentences
Recent Examples on the Web The book pairs those affirmations with personal essays about her childhood, her miscarriages, her kids, and observations about nature, including the way serotinous pinecones only release their seeds in fire. 
Sophy Chaffee, San Diego Union-Tribune, 2 Jan. 2022
Sophy Chaffee, San Diego Union-Tribune, 2 Jan. 2022 Word History
Etymology
Latin serotinus coming late, from sero late — more at soiree
First Known Use
circa 1656, in the meaning defined above